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In this blog, from theory to practice, the system introduces iptables. If you want to know iptables from scratch, you can check the list of iptables articles, and the direct link is as follows.The maintenance and testing institutions of fire-fighting facilities with secondary qualifications can be engaged in the testing, repair and maintenance of fire-fighting facilities for buildings with a single building area of less than 40,000 square meters, factories and warehouses with fire risks of less than Class C. Fire safety assessment institutions with secondary qualifications can engage in fire safety assessment of social units and consulting activities on fire laws and regulations, fire technical standards, rectification of general fire hazards, etc.2926I have a "bubble MM true sutra", which has various strategies for bubble MM, such as the steps to eat western food, the methods to watch movies, etc. When dating MM, just be an Interpreter and follow the above script.喜欢用游戏来开玩笑的大学生“精神”、喜欢偶像的怪力妹妹精朱莉，俩兄妹不管遇到幸运或不幸的状况都能用外星人般让人捉摸不定的行动制造出让人啼笑皆非的结果。杨长帆摆手道，今后若是跟他有来往，翘儿你回避便是了。Conclusion: As the name implies, singleTop, if the current instance is at the top of the current task stack, it will be reused directly to test scenario 1. If the current instance is no longer at the top of the stack, create a new instance, such as Test Scenario 2, because it jumps from FirstActivity to SecondActivity every time. Although the SecondActivity instance already exists at the time of jumping to SecondActivity for the second time, another SecondActivity instance is created because it is not at the top of the stack.